212. The sequence of layers of atmosphere from earth to upwards is

A. troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
B. troposphere, stratosphere, stratopause, mesosphere , ionosphere
C. troposphere, tropopause, stratosphere, thermosphere, exosphere
D. troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause
✅ The correct answer is option A.
The sequence of layers of atmosphere from earth to upwards is troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere).

215. The Plio-Pleistocene boundary lies about ____ years ago, at the beginning of the interval of warming after the last Pleistocene glaciations.

A. 1,00,000
B. 1,000
C. 10,000
D. 100
✅ The correct answer is option C.
The Plio-Pleistocene boundary lies about 10,000 years ago, at the beginning of the interval of warming after the last Pleistocene glaciations.